# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
"""Tests for the distributed tracing policy."""
import logging

from azure.core.pipeline import Pipeline, PipelineResponse, PipelineRequest, PipelineContext
from azure.core.pipeline.policies import DistributedTracingPolicy, UserAgentPolicy, RetryPolicy
from azure.core.pipeline.transport import HttpTransport
from azure.core.settings import settings
from tracing_common import FakeSpan
import time
import pytest
from utils import HTTP_RESPONSES, create_http_response, request_and_responses_product

try:
    from unittest import mock
except ImportError:
    import mock


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_distributed_tracing_policy_solo(http_request, http_response):
    """Test policy with no other policy and happy path"""
    settings.tracing_implementation.set_value(FakeSpan)
    with FakeSpan(name="parent") as root_span:
        policy = DistributedTracingPolicy()

        request = http_request("GET", "http://localhost/temp?query=query")
        request.headers["x-ms-client-request-id"] = "some client request id"

        pipeline_request = PipelineRequest(request, PipelineContext(None))
        policy.on_request(pipeline_request)

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 202
        response.headers["x-ms-request-id"] = "some request id"

        assert request.headers.get("traceparent") == "123456789"

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))
        time.sleep(0.001)
        policy.on_request(pipeline_request)
        try:
            raise ValueError("Transport trouble")
        except:
            policy.on_exception(pipeline_request)

    # Check on_response
    network_span = root_span.children[0]
    assert network_span.name == "/temp"
    assert network_span.attributes.get("http.method") == "GET"
    assert network_span.attributes.get("component") == "http"
    assert network_span.attributes.get("http.url") == "http://localhost/temp?query=query"
    assert network_span.attributes.get("http.user_agent") is None
    assert network_span.attributes.get("x-ms-request-id") == "some request id"
    assert network_span.attributes.get("x-ms-client-request-id") == "some client request id"
    assert network_span.attributes.get("http.status_code") == 202
    assert "error.type" not in network_span.attributes

    # Check on_exception
    network_span = root_span.children[1]
    assert network_span.name == "/temp"
    assert network_span.attributes.get("http.method") == "GET"
    assert network_span.attributes.get("component") == "http"
    assert network_span.attributes.get("http.url") == "http://localhost/temp?query=query"
    assert network_span.attributes.get("x-ms-client-request-id") == "some client request id"
    assert network_span.attributes.get("http.user_agent") is None
    assert network_span.attributes.get("x-ms-request-id") == None
    assert network_span.attributes.get("http.status_code") == 504
    assert network_span.attributes.get("error.type")


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_distributed_tracing_policy_error_response(http_request, http_response):
    """Test policy when the HTTP response corresponds to an error."""
    settings.tracing_implementation.set_value(FakeSpan)
    with FakeSpan(name="parent") as root_span:
        policy = DistributedTracingPolicy(tracing_attributes={"myattr": "myvalue"})

        request = http_request("GET", "http://localhost/temp?query=query")

        pipeline_request = PipelineRequest(request, PipelineContext(None))
        policy.on_request(pipeline_request)

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 403

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))
        network_span = root_span.children[0]
        assert network_span.name == "/temp"
        assert network_span.attributes.get("error.type") == "403"


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_distributed_tracing_policy_attributes(http_request, http_response):
    """Test policy with no other policy and happy path"""
    settings.tracing_implementation.set_value(FakeSpan)
    with FakeSpan(name="parent") as root_span:
        policy = DistributedTracingPolicy(tracing_attributes={"myattr": "myvalue"})

        request = http_request("GET", "http://localhost/temp?query=query")

        pipeline_request = PipelineRequest(request, PipelineContext(None))
        policy.on_request(pipeline_request)

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 202

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))

    # Check on_response
    network_span = root_span.children[0]
    assert network_span.attributes.get("myattr") == "myvalue"


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_distributed_tracing_policy_badurl(caplog, http_request, http_response):
    """Test policy with a bad url that will throw, and be sure policy ignores it"""
    settings.tracing_implementation.set_value(FakeSpan)
    with FakeSpan(name="parent") as root_span:
        policy = DistributedTracingPolicy()

        request = http_request("GET", "http://[[[")
        request.headers["x-ms-client-request-id"] = "some client request id"

        pipeline_request = PipelineRequest(request, PipelineContext(None))
        with caplog.at_level(logging.WARNING, logger="azure.core.pipeline.policies.distributed_tracing"):
            policy.on_request(pipeline_request)
        assert "Unable to start network span" in caplog.text

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 202
        response.headers["x-ms-request-id"] = "some request id"

        assert request.headers.get("traceparent") is None  # Got not network trace

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))
        time.sleep(0.001)

        policy.on_request(pipeline_request)
        try:
            raise ValueError("Transport trouble")
        except:
            policy.on_exception(pipeline_request)

    assert len(root_span.children) == 0


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_distributed_tracing_policy_with_user_agent(http_request, http_response):
    """Test policy working with user agent."""
    settings.tracing_implementation.set_value(FakeSpan)
    with mock.patch.dict("os.environ", {"AZURE_HTTP_USER_AGENT": "mytools"}):
        with FakeSpan(name="parent") as root_span:
            policy = DistributedTracingPolicy()

            request = http_request("GET", "http://localhost")
            request.headers["x-ms-client-request-id"] = "some client request id"

            pipeline_request = PipelineRequest(request, PipelineContext(None))

            user_agent = UserAgentPolicy()
            user_agent.on_request(pipeline_request)
            policy.on_request(pipeline_request)

            response = create_http_response(http_response, request, None)
            response.headers = request.headers
            response.status_code = 202
            response.headers["x-ms-request-id"] = "some request id"
            pipeline_response = PipelineResponse(request, response, PipelineContext(None))

            assert request.headers.get("traceparent") == "123456789"

            policy.on_response(pipeline_request, pipeline_response)

            time.sleep(0.001)
            policy.on_request(pipeline_request)
            try:
                raise ValueError("Transport trouble")
            except:
                policy.on_exception(pipeline_request)

            user_agent.on_response(pipeline_request, pipeline_response)

        network_span = root_span.children[0]
        assert network_span.name == "/"
        assert network_span.attributes.get("http.method") == "GET"
        assert network_span.attributes.get("component") == "http"
        assert network_span.attributes.get("http.url") == "http://localhost"
        assert network_span.attributes.get("http.user_agent").endswith("mytools")
        assert network_span.attributes.get("x-ms-request-id") == "some request id"
        assert network_span.attributes.get("x-ms-client-request-id") == "some client request id"
        assert network_span.attributes.get("http.status_code") == 202

        network_span = root_span.children[1]
        assert network_span.name == "/"
        assert network_span.attributes.get("http.method") == "GET"
        assert network_span.attributes.get("component") == "http"
        assert network_span.attributes.get("http.url") == "http://localhost"
        assert network_span.attributes.get("http.user_agent").endswith("mytools")
        assert network_span.attributes.get("x-ms-client-request-id") == "some client request id"
        assert network_span.attributes.get("x-ms-request-id") is None
        assert network_span.attributes.get("http.status_code") == 504
        # Exception should propagate status for Opencensus
        assert network_span.status == "Transport trouble"


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_span_retry_attributes(http_request, http_response):
    class MockTransport(HttpTransport):
        def __init__(self):
            self._count = 0

        def __exit__(self, exc_type, exc_val, exc_tb):
            pass

        def close(self):
            pass

        def open(self):
            pass

        def send(self, request, **kwargs):
            self._count += 1
            response = create_http_response(http_response, request, None)
            response.status_code = 429
            return response

    settings.tracing_implementation.set_value(FakeSpan)

    http_request = http_request("GET", "http://localhost/")
    retry_policy = RetryPolicy(retry_total=2)
    distributed_tracing_policy = DistributedTracingPolicy()
    transport = MockTransport()

    with FakeSpan(name="parent") as root_span:
        pipeline = Pipeline(transport, [retry_policy, distributed_tracing_policy])
        pipeline.run(http_request)
    assert transport._count == 3
    assert len(root_span.children) == 3
    assert root_span.children[0].attributes.get("http.request.resend_count") is None
    assert root_span.children[1].attributes.get("http.request.resend_count") == 1
    assert root_span.children[2].attributes.get("http.request.resend_count") == 2


@pytest.mark.parametrize("http_request,http_response", request_and_responses_product(HTTP_RESPONSES))
def test_span_namer(http_request, http_response):
    settings.tracing_implementation.set_value(FakeSpan)
    with FakeSpan(name="parent") as root_span:

        request = http_request("GET", "http://localhost/temp?query=query")
        pipeline_request = PipelineRequest(request, PipelineContext(None))

        def fixed_namer(http_request):
            assert http_request is request
            return "overriddenname"

        policy = DistributedTracingPolicy(network_span_namer=fixed_namer)

        policy.on_request(pipeline_request)

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 202

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))

        def operation_namer(http_request):
            assert http_request is request
            return "operation level name"

        pipeline_request.context.options["network_span_namer"] = operation_namer

        policy.on_request(pipeline_request)

        response = create_http_response(http_response, request, None)
        response.headers = request.headers
        response.status_code = 202

        policy.on_response(pipeline_request, PipelineResponse(request, response, PipelineContext(None)))

    # Check init kwargs
    network_span = root_span.children[0]
    assert network_span.name == "overriddenname"

    # Check operation kwargs
    network_span = root_span.children[1]
    assert network_span.name == "operation level name"
